Are you suspicious?
Do black cats and ladders make you nervous?
I've never had a problem with friday the thirteenth; in fact, I've actually had good luck.
Maybe, it's the "law of attraction" working. I believe I'll have a good day...so I do.
Maybe, if you have a bad day...it's the same thing. You believe bad things will happen...so they do.
Don't let a date get in the way of you having a good day. :o)